<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/demo1.css">
</head>

<body>
    <h1 id="title">Hello</h1>
    <button>Click me</button>
    <ul>
        <li class="list">First</li>
        <li class="list">Second</li>
        <li>Third</li>
    </ul>
    <script></script>
</body>

</html>